d 1 21st IAEA Fusion Energy, Chengdu 1 IAEA, Chengdu Progress in understanding impurity transport at JET C. Giroud 1 , C. Angioni 2 , G. Bonheure 3 , I. Coffey 4 , N. Dubuit 5 , X. Garbet 5 , R. Guirlet 5 , P. Mantica 6 , V. Naulin 7 , M.E. Puiatti 8 , M. Valisa 8 , A.D. Whiteford 9 , K-D. Zastrow 1 , M.N.A. Beurskens 1 , M. Brix 1 , E. de la Luna 10 , K. Lawson 1 , L. Lauro-Taroni 8 , A. Meigs 1 , M. O’Mullane 9 , T. Parisot 5 , C. Perez von Thun 1 , O. Zimmermann 11 and the JET-EFDA Contributors. 1 2 3 4 5 6 7 10 8 9 11
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Carine Giroud 1 21st IAEA Fusion Energy, Chengdu 16.10.2006 Carine Giroud 1 IAEA, Chengdu 16.11.2006 Progress in understanding impurity transport at JET.
Carine Giroud 3 21st IAEA Fusion Energy, Chengdu Content Observation of anomalous impurity transport at JET – Reduction of Nickel peaking by electron heating Brief description of recent development in the turbulent transport theory Comparison of experiment with theoretical predictions – A transition of the dominant instability driving the transport could explain the difference in Nickel peaking – Experimental test of Z dependence predicted by turbulent transport theory
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• Observation of anomalous impurity transport at JET– Reduction of Nickel peaking by electron heating
• Brief description of recent development in the turbulent transport theory
• Comparison of experiment with theoretical predictions– A transition of the dominant instability driving the transport could explain the difference in Nickel peaking– Experimental test of Z dependence predicted by turbulent transport theory
Illustration of complex Z dependence of turbulent transport
• D and V calculated with the linear version of the gyrokinetic code GS2: - trace impurity considered.- only the fastest growing mode is taken in the quasi–linear model- no neoclassical transport included.
• JET experiments confirm earlier observations that neoclassical transport is not sufficient to describe impurity transport in bulk plasma
• First comparison between turbulent impurity transport theory and experiments show encouraging results:− A transition in the dominant instability driving the transport could explain the observed reversal of Ni convection− Same range of peaking as calculated by linear gyrokinetic calculation are measured : no strong increase of V/D as a function of Z. Turbulent transport could give the means for controlling heavy impurity peaking in ITER
• JET is set out to systematically compare theoretical predictions with experiment in coming campaign using JET upgraded CXRS capability..